Chapter 9 Chemical Reactions

Multiple Choice

How do skeleton equations and chemical equations differ?

• Skeleton equations represent the same information as chemical equations.
• Skeleton equations include coefficients for reactants and products.
• Chemical equations are simpler than skeleton equations.
• Skeleton equations differ from chemical equations in that they do not show the relative amounts of reactants and products.

Multiple Choice

How are chemical equations balanced?

• By removing atoms from one side of the equation.
• By changing the chemical symbols of the elements involved.
• By adding more reactants without changing the products.
• Chemical equations are balanced by adjusting coefficients to equalize the number of atoms for each element on both sides.

Multiple Choice

What are combustion reactions?

• Combustion reactions are rapid reactions between a fuel and oxygen that produce heat and light.
• Combustion reactions occur only in the absence of oxygen.
• Combustion reactions are slow processes that do not produce heat.
• Combustion reactions involve only solid fuels without any gases.

Multiple Choice

What are synthesis reactions?

• Synthesis reactions occur when a single substance is heated to produce energy.
• Synthesis reactions are chemical reactions where two or more substances combine to form a single product.
• Synthesis reactions involve the breakdown of a single substance into multiple products.
• Synthesis reactions are only physical changes without any chemical transformation.

Multiple Choice

What are decomposition reactions?

• Decomposition reactions create new compounds from simpler substances.
• Decomposition reactions involve the combination of two or more elements.
• Decomposition reactions involve the breakdown of a compound into simpler products.
• Decomposition reactions are a type of synthesis reaction.

Multiple Choice

What are single-replacement reactions?

• Single-replacement reactions involve two elements combining to form a new compound.
• Single-replacement reactions are reactions where two compounds exchange elements.
• Single-replacement reactions occur when elements are added to a solution without any change in composition.
• Single-replacement reactions are chemical reactions where one element replaces another in a compound.

Multiple Choice

What are double replacement reactions?

• Double replacement reactions are chemical reactions where two compounds exchange ions to form two new compounds.
• Double replacement reactions involve the formation of a single new compound.
• Double replacement reactions are only found in organic chemistry.
• Double replacement reactions do not involve any ion exchange.

Multiple Choice

What does aqueous mean?

• Aqueous is a term used for gaseous substances.
• Aqueous refers to a solid state of matter.
• Aqueous means relating to oil or fat.
• Aqueous means relating to, or containing water.

Multiple Choice

What is eliminated from complete ionic equations to form a net ionic equation?

• Spectator ions
• Catalysts
• Products
• Reactants

Multiple Select

Reactions in aqueous solutions may form which of the following? Select all that apply.

• liquids
• Sorry I wasn't listening

• solids
• gases